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21422663 = 44514813
BaseRepresentation
bin101000110111…
…0001001000111
31111022101100222
41101232021013
520441011123
62043054555
7350042513
oct121561107
944271328
1021422663
1111102189
12721145b
134590b42
142bb9143
151d326c8
hex146e247

21422663 has 4 divisors (see below), whose sum is σ = 21431928. Its totient is φ = 21413400.

The previous prime is 21422641. The next prime is 21422689. The reversal of 21422663 is 36622412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21422663 - 214 = 21406279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2045 + ... + 6857.

It is an arithmetic number, because the mean of its divisors is an integer number (5357982).

Almost surely, 221422663 is an apocalyptic number.

21422663 is a deficient number, since it is larger than the sum of its proper divisors (9265).

21422663 is an equidigital number, since it uses as much as digits as its factorization.

21422663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9264.

The product of its digits is 3456, while the sum is 26.

The square root of 21422663 is about 4628.4622716405. The cubic root of 21422663 is about 277.7310814957.

The spelling of 21422663 in words is "twenty-one million, four hundred twenty-two thousand, six hundred sixty-three".

Divisors: 1 4451 4813 21422663